Oil Palm Shell (OPS) concrete can be used in different fields of construction. To determine more accurately the fields of application, it is important to know and understand the behaviour of OPS concrete over<span ...Oil Palm Shell (OPS) concrete can be used in different fields of construction. To determine more accurately the fields of application, it is important to know and understand the behaviour of OPS concrete over<span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> the</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> long term and when it is in aggressive environments. This paper presents the results of studies conducted on the durability of OPS concrete. Water absorption capacity, electrical resistivity and apparent diffusion of chloride ions have been measured on different concrete samples. In addition, the behaviour of OPS concretes to carbonation was studied in an environment rich in carbon dioxide. Results show that OPS concrete ha</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">s</span></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;"> an absorptivity of 0.97 kg/m</span><sup><span style="font-family:Verdana;">2</span></sup></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">·</span></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;">h</span><sup><span style="font-family:Verdana;">1/2</span></sup><span style="font-family:Verdana;">, an electrical resistivity of 64.37 Ω</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">·</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">m and an apparent diffusion coefficient of chloride ions of 3.84</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> × </span></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;">10</span><sup><span style="font-family:Verdana;">-12</span></sup><span style="font-family:Verdana;"> m</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">/s after 90 days. All these results of OPS concrete are very close to those of concrete with normal aggregate and other lightweight concrete</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">,</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> which mean OPS concretes have globally good properties with regard to durability</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">.</span></span></span>展开更多
为降低船舶造价,最大限度地实现船舶的轻量化设计,基于船体尺寸优化的思想,以油船中剖面结构为研究对象,采用法国船级社规范计算工具Mars2000对油船中剖面进行结构定义和载荷计算,通过优化分析软件ISIGHT集成设计变量、约束条件、目标函...为降低船舶造价,最大限度地实现船舶的轻量化设计,基于船体尺寸优化的思想,以油船中剖面结构为研究对象,采用法国船级社规范计算工具Mars2000对油船中剖面进行结构定义和载荷计算,通过优化分析软件ISIGHT集成设计变量、约束条件、目标函数,建立参数数据流;开发基于协调共同结构规范(Harmonized Common Structure Rules,HCSR)计算的船舶尺寸优化系统,获得油船中剖面结构设计方案。优化后中剖面面积比原始设计减少6.4%,实现油船的轻量化设计。展开更多
文摘Oil Palm Shell (OPS) concrete can be used in different fields of construction. To determine more accurately the fields of application, it is important to know and understand the behaviour of OPS concrete over<span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> the</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> long term and when it is in aggressive environments. This paper presents the results of studies conducted on the durability of OPS concrete. Water absorption capacity, electrical resistivity and apparent diffusion of chloride ions have been measured on different concrete samples. In addition, the behaviour of OPS concretes to carbonation was studied in an environment rich in carbon dioxide. Results show that OPS concrete ha</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">s</span></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;"> an absorptivity of 0.97 kg/m</span><sup><span style="font-family:Verdana;">2</span></sup></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">·</span></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;">h</span><sup><span style="font-family:Verdana;">1/2</span></sup><span style="font-family:Verdana;">, an electrical resistivity of 64.37 Ω</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">·</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">m and an apparent diffusion coefficient of chloride ions of 3.84</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> × </span></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;">10</span><sup><span style="font-family:Verdana;">-12</span></sup><span style="font-family:Verdana;"> m</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">/s after 90 days. All these results of OPS concrete are very close to those of concrete with normal aggregate and other lightweight concrete</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">,</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> which mean OPS concretes have globally good properties with regard to durability</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">.</span></span></span>
文摘为降低船舶造价,最大限度地实现船舶的轻量化设计,基于船体尺寸优化的思想,以油船中剖面结构为研究对象,采用法国船级社规范计算工具Mars2000对油船中剖面进行结构定义和载荷计算,通过优化分析软件ISIGHT集成设计变量、约束条件、目标函数,建立参数数据流;开发基于协调共同结构规范(Harmonized Common Structure Rules,HCSR)计算的船舶尺寸优化系统,获得油船中剖面结构设计方案。优化后中剖面面积比原始设计减少6.4%,实现油船的轻量化设计。